Improvement in pressure-blocks for planing-machines



UNITED STATES PATENT OEETCE.

JOHN LAWRENCE, OF 'EAST MORRISANIA, SSIGNOR TO ALFRED T. SERRELL, OF NEW YORK, N. Y.

IMPROVEMENT IN PRESSURE-BLOCKS FOR PLANING-MACHINES.

Specilicaiion formingpart of Letters PatcDtNO. 39,996, dated September 15, 1863; anterlated December 14, 1862.

'.To all whom, it ma opneemt:

Be it known that I, JOHN LAwREcn, of East Morrisania, in the county of Westchester and State of New York, have invented, made, and applied to use a cert-aiu new and useful Improvement in Pressure-Blocks-for Ilaning- Machines; and I do hereby declare that the following is afnll, clear, and exact description 'of my said invention, reference being had to the annexed drawings, making part of this specification, wherein Figure 1 is a plan of myl said improvement. Figi 2 is a side elevation of the same, and Fig. '3 is a cross-section at the line a: x.

Similar marks of reference denote the same parts in alltheigures.

In planing moldings of any character thecutters pass into the'wood deeper at some places' than at others, and at such points especially the lifting operation of th'e cutters tends to l splinter the wood, particularly when the stuff is not straight-grained. The wood usually employed is sawed in an angular form for making moldings; hence a straight-roller would not come in contact with the entire surface;`

besides whieh,the point of contact of said roller with vthe stuff'being some little distance from the rotary cutter does not prevent the splintering as aforesaid. It is necessary, therefore, to hold the stuit` down as close up to the cuttersas possible, particnlarlyin planing thin moldings. To effect this object a block of wood has been employed, but the same had to be varied with every change of pattern in the material being operated on; besides this, said wood pressure-block is not durable or fully 'operative in lpreventing the material splintering.

The nature of my said invention consists in 4the employment of a sectional pressure-block that can be set to correspond with any form of material to be operated on by loosening a screw or clamp to allow said sections to-con- 'form themselves to the shape of the stutl, and

when again clamped said pressure-block performs the duty required of keeping the matcrial down to the bed ofthe machine and preventing splintering.

In the drawings, a is the rotary ci1tter,1it.ted with the shape of cutter required and driven by competent power.

b is the bed of the machine, and c is a feedroller that causes the material to progress regularly throngh the machine.

e nare slides,whichfshonld be inclined, as

shown, and they can be adjusted nearer to or down to the strip of material f, I make use of the rock-shafth, arms 3 3, and weighted lever 4.. The arms 3 3 are forked at. their ends, taking grooves in nuts 5 5 onthe screws o Ao, that areattached to the ends of the frame 7L. These nuts 5 5 pass into openings in the' upper ends of the slides a c and areeach provided with a collar taking the upper end of said slides e e. By adj listing these nuts 5 5 the downward movement of the sectional.pressureblock is adjusted and the weight 4, prevented from driving the said pressureblock too far down,

in case the strip f is drawn away from bcneath, thereby always leaving the space required for the introduction of another strip of material.

The advantages resulting from the use ofmy sectional pressure -block in preventing splinteriug by the action of the rotary cutter in planing moldings will be apparent from the foregoing. y K

The aforesaid sectional pressure-block may be kept down by springs, levers, or other suitable mechanism. 'Vhat I claim, and desire to secure by Letters Patent, is y p .1. Thescctional pressure-block,constructed,

substantially as specified, to hold the material against the action .of the rotary cutter,l forthe purposes set forth.

2., The arrangement of the shaft 71, arm 3,

nuts 5, and screws 0, to give the required pressure and control the motion of the prcssure-block, as set forth.

- In witness whereof I have hereunto set my signature this 10th day ofApril, 1861..

J OI-IN LAWRENCE.y X'Vitncsses:

LEMUEL W. SERRELL, .'luos. GEO. HAROLD. 

